To facilitate mounting of a longitudinal beam when a continuous footing is constructed by using a PC footing beam member and a PC base plate, to thereby facilitate mounting of longitudinal reinforcements in the beam member.

The PC footing beam member 1 is formed of two rectangular side walls 11 and two partition walls 13 longitudinally connecting the side walls to each other, and an upper V-shaped groove 16 is formed in an upper bed of the partition wall 13, whereby the reinforcement is arranged in the V-shaped groove 16. Then, the frame-like PC base plate 2 has a horizontal recess 26 at its lateral center, in which the PC footing beam member 1 is mounted, and a lower V-shaped groove 27 is formed at the center of the horizontal recess 26, for arranging the reinforcement therein.